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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9cc4cd25e425735fc83d004c4b91d3dbeb95bca92660c3744a75ac9d69903d85' 
  AND token = 'EdWqCclttRvvLdFqmvXw02aKK1Dr3D/gqPuX49n7VRE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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