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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6fcde2e6bf69f5b307e4c1a5d9d1e4f1e95a9b4c8271d3c3471585a0da633e17' 
  AND token = 'l3mO4l29frn5IUwlxOpY5C9xuUEHsVT1Jmxas2W1ayY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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