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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bcc1bd1d3ee62e657b293355f0010e1fc8805f051c4b02adf26915518f430d2d' 
  AND token = 'IrLMf9LeIzOWKzilzG2su5ES564T3385JynttJFGJMc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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