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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '002a6a830b7a47f86130875f4cf74c9be88a2c372af44ee10a9a0e7aafef863f' 
  AND token = '+Sei8jOVjw3Y2yEK4kEZAUFUlj4GVti1GGC+c6/FiEU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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