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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '46a386a63f7a0ad4ac2755d117ef7e75e22edf7a5f9ef9f77fe30bba4cef5985' 
  AND token = 'f9LAE1QPNtVUzMq3WSGEkNeF6ID7CHqdfEuvST32OQI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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