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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '598045179e2d61274e16554e98ca73d9a408380cde836965bf3f3f0358e80f86' 
  AND token = 'N0osxisVwDs8fJEv6DdyAmbAKGL3gLZlaafwGGgkRJQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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