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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f4a2be876a7e8874be260ca64f6d6089456d21499b293f82672f50270e1c7fe3' 
  AND token = 'zmZXSflIceqxOX7pEVYxZvlra7HY9Spceln3n7cgNC0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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