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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '063b2c5bef389c64d5c84c6bd14d568ab4909d081743d01c773ce40f5c84359c' 
  AND token = 'rSNW3FErIkwkfMb9ESsxIWwCvaSO9+SxQ5a6Agdnlh0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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