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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a8972c14d7e0a86d8057fc19eaf96837eccbcedf1b9825865eee92f070a38a0f' 
  AND token = '8A4atIxOv5p7OGoGLlpYE1yJFQvTKPMBmUtB3jlMv9w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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