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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '828c85677cc0d5cba827ca1c7d0d969fde657dc119a31fd270500ab002cbd728' 
  AND token = '4J6WZLWfOf4hSyG6UuxM0BR0Gir8DLJ57mzKvYtkfVg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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