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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9788b47988027f18355ff2bf883b08d319d4b8f1cf0f9ad83efc5e285637e5f' 
  AND token = 'AIiRlFfR8w5N4KKNNbuSXZtYY1Bt7rHQl1dlcO50bSI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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