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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '436a03c1f1c4a4a7b81ff1f92d00101986fe437cc2a10c6355d111886258a567' 
  AND token = 'EctMXQ8/tmHX63BgdFzLcsRzDSIHUMGs3PWW1lcNUxc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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