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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56b31060ba9a1c0cf33fd40992ac5eb8b424efb5f5ce9cdec5fe59bbdc223f4e' 
  AND token = 'MdP9C+nFCv1zWD8WsC8lcw2TNEyL0hRFoqs/OxN+WLI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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