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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd76e518a48e7e3ae9a3198c9fd23053b9547086120360f8c79d68008bc91e229' 
  AND token = 'N3PUE737go73qvw3xWqIuhntSGN2xRGZno68Ydygm6U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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