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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9233672cee16cf1bc9b60afa2e01801debd158f3eaa79e21b9ba2a9e5833a658' 
  AND token = '33tsbLaoPfHPczHP0YyBaYfSlFyrXEDSJDLeA3ntpzw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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