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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47b55ab1a818c7ccde777c3e6f0e876abf9cab08ae997f78cf98b09414a0e6c7' 
  AND token = 'nTeppgkdH35W8vaEN0xvLxEgHoQyeh2SukoL8BvsJHA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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