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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04dca8f676f059baf3ff4e2d153863e0da519d8db4fb5bb4fffa19ef47d79301' 
  AND token = '7spMrtmfcM1rLId5+x/ohnJsRIxCuAqPcdyoQ4nEYis=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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