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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d7f0f51264e84752051ce6a33a51f3937d2b7eca3a8df7e6c0ce00834cbb932' 
  AND token = '98vpydNu+gCs5R3hEdJtB2lQ7Lmg4T2OoiRLNtBwpY0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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