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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '560fd31a0cb84589cae270406782b6a0e24059bbbd101f253a576b0261f52eb5' 
  AND token = '5T8gB59jOIcOt+0j/4D4WJY1zPCBeUsS5lYnN5exsC0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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