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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '00392767ae811d0f88abff92de48846c34e33605df162426fcf9335e92bcb1ac' 
  AND token = 'Y/GcEz6em9eURfMPoFmXfB09PICLXGFh9tLsH8Obdfs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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