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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aedeb7084f809030dec4cf54462bdf06b90dc94eb194c8cc9407d05bd2df2f45' 
  AND token = 'm6dgpYJiWvig6m0XfC7qPFV2OxR+yeUf01yyRxM9Tq4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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