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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '01b918ac62ec38bbbf84e3ffc16f80fda65e4608b2c6fe2fa1a54e857077d338' 
  AND token = 'oqGfpbCCENVjTR6J/Yw2Fm6vDyMo6jw/f1Ho7sEiw9c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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