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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe5a0eb4f2bef71066839c05ea5acb913ddf210f0a9ebfee6a722b2f322e1fae' 
  AND token = 'yq306ze+fOZR9veki9RSoH+k/8ACWEaGPSviV0aTVHo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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