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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e9fb5ec92a7c40f3148cb8fe1479327eeb5a1467fc777dadb2717fe2d9b9e49' 
  AND token = 'mC1VyAZGhZNIJWmWSBh9c2NDwn22XpFtgZLvY6V7B24=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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