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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71bcf7256187980985397006653aebc31ae5e987dc085277670d4b1f2d4f7854' 
  AND token = 'LBzH5RFRqJEYnZdsCA2pEcEsNLPjNvy3x6Lea9ieFBI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00060

JSON explain

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