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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'efe04b5dd8ee8062f115e09bb9ddd19179f057d64986918b8919899f0caeae5c' 
  AND token = 'fvWZUefvAw66nfVYZq8A9H5gVR7ENJXDpXVbKR0kB+g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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