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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '57e6ffaf83c46fcf3c0abe1ffe5fabd3c1fc34a8e6c8a3f423b513f91b3929d2' 
  AND token = '98BStUQ1JneEsspakw9TybsbVs5T3DUKtk1rz+wf0oQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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