SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '318ec943ea31a179d95c8da82f13675f73a700fb86577b06fb7da45d28d98e2b' 
  AND token = 'fu+N/o/lr0+quQsVmGclE2jq6PLuThoLSEwjLI7Qr/A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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