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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '843d9e39fe818a5746606cc9bbb49a20ab67447446f4092bc0de9b0774f3a54c' 
  AND token = 'g65254WKLs1phNRbjHujWhz8hJs1m7KRiCi9J/G4Kog=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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