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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db0fb7a4b3958bf63a4291cfe6df2d8d37cb362af792e4813bad89b88fc94e33' 
  AND token = 'FFGTo3YrrJUmORrBnf5swx9UWsBeu0sQWhG9eSBj2Zc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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