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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf7eaf79636ee57335c81a881348c5882ec1c8a4615b9965fbf2d2e779077a5a' 
  AND token = 'mHIjnECaEGxwO0xGeqYq8qfnseOJlF4v0eUz9ItMJ+I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}