SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ebb4f6c445401c8e7fd2b01e8dc38fbc77d00c1ff9b460821f419632d3a59db7' 
  AND token = 'mM5NRZxPPXJorqLURINBuY98slFZuVmirpZ+Aa3PSPg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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