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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb65a852178018ab4afa9a83fd5f5cd31c8813d254c3946ed363db976d53ca6e' 
  AND token = '30ktTxURT4B3jh7WHg0HLntoewkJPerFbnDNZpRwj2Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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