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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3c8483c1859cc64a43cdbbbc7a0e7e767df0ba905608d7fd8eb555656d5d05d' 
  AND token = 'd/WlqyfPVk0zpEDTSIU2+u696JyV/0VV7H5UAPUTX+Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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