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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d7ddd31c74dd2cb54f96ac8b0c5705949ec702d4d50286bbe8b302e981e3b2b' 
  AND token = '1tGr7z7USqn4BnP1MsVYhI4eTxgjslu9clsDZHOD9kg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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