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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e5a075328c9e605ff020b70de92de629cf41ee27e1c212493f91b67142435e9a' 
  AND token = 'FWkn5yQ+wRyo6nfcn6azITsMqxSy0ygxCcMDp4Z7kug=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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