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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04258c6e07b997b7d445d7b3bdfebadf5e2de2826e4d65405c7b87df756bda34' 
  AND token = '5vW9wpVqsgRAkST6kX2GgYd1qtaGDP+pByCSTiqVtJY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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