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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea24e3dd3d12692166120c854d6b87ca9b55f1eec74b8f7b5b066736ddee7012' 
  AND token = 'mcpHtpgodbfsqUniZNNk0ZFPMdArkkgEVTX8YfTq5dw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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