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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0a56d25ffa1b86c83b1c49263c1a2495a9d6477cbb2cfa968a53dc46e924c0b' 
  AND token = 'sfVquaF80GNs9CWsaUM+3Tl7p2hvoSp1QaLKsOY4lvI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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