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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cee3716b00ff41c25fecef1ffb8adc861f2dc597f1aedbffdd3ff6dc348b3db3' 
  AND token = 'Y7XKTq2OTA7jC+I1RoVh6A/s3KNjUH2YsSLwqGq6OJM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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