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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ca9fc2114fe39728751f7a84109ebeb16ace50e0fc1784679841c06562dd2b1' 
  AND token = 'X3l5urdbMazr61SSwv+eZy4nXvV7PRBmJVRo9l5tyTw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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