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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0fc9aab13a1b75ee300e0ff5a85ad8b02deec50f817ff09b222e1884ccb100ad' 
  AND token = 'vhu8lfKEBBTQGdjzkmFUSp1xvQivkjBJrgdKFoHaFao=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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