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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe754db11c3790c651b95ba9c56690a66274f1d7ea952a5e0acee9e5d9e6f8e9' 
  AND token = 'McMYCE8OBnD0NuNaIKgz0fEn4cXyph868fcF0PSxZ+U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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