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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5bf4890d6eb9f75aad55dfc8f762c14e99a4e34f979e2ad8292e140d8f36fd57' 
  AND token = 'y/h1Y6Ylv3ykcyhloNGUbddJhnkaAPSd0+zw82j/Q8A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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