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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8658a2907bcd8ceb280e95ee2d127a9799ddabc9bf0c793e5264721c85fa167e' 
  AND token = 'tDBluf7AEvG8iBf7UXG9HT3mWrJmcifwRmKFVvN31rs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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