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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a42cbe2f096e1fdddaabd767fde0e9b6a9d1a3f35306d79b225332db5d42f9ad' 
  AND token = 'LEgIvYBJ4ATIVtLtIjBaG7KnOEcwkLm435PUoR0APyE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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