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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f1d75ca5c70d2b35460d75fdd432238933922480fbb83159a5217618dba8548' 
  AND token = 'J6fh14v35iTgxR+cvHncpq0x5rGzehmRywRXgEt34OE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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