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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7bc75e8c2a2670236d4ffa2ce3723c85f77a53863b7ca65857a7dbcf74b1880b' 
  AND token = 'HlNz8RdRd8J20kuBfDfoK+KZD75Xr1QT55rx/n5mIhY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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