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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02956dc7e15cc482fb87fa4949ae7d526b05aec42e8b49a0418267b582a78aec' 
  AND token = '17RB+bmXP/Ty5HE6srj/SMNtjwcy5oMOSBKrQtuNFus=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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