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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e8e58230c0a2a4d2e1054042048e11c685ee6ff0ed02b26193ce4274e1ac93f3' 
  AND token = 'wCK6gk6LuOUrnJ86HwoYy4M7jJbb8NbD2oDmflk9txk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00009

JSON explain

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