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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb540282dabbe99da963cc97b626db54e12a7b51f01bc86286dd43d87c282971' 
  AND token = '8zkqwGWckvBm11SJmyuRwPNVeZeEIUiyysw8LyoleAM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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