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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c754ea658246ce4d3e5fb9d835f9ea4f67d7df41c4f7d12a1c971a024b756fcf' 
  AND token = '99SsVs40S8FaqjC+1OA+IeHRi32DT74rpgndQJ8NWLU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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