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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ffdd21a336f5f24e69ed33f7f603a76df5217d36ddbb8c95b20a629eee4e3bc3' 
  AND token = 'jguEPvU7rZnP/6LJ93KOm1vuJ/auqGGT5oQ4Uphdy7c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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