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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '66a8da8461298dd24bb28fff0a1ab997466fec099b976e4a5e0ca50716ff6a31' 
  AND token = 'L5GT0yNdl5wNzWvOg2xxXvnmHG1fdSneotayL93wcC0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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