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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5b2f7ab69d1bea54f91bb84ad71105b133b66cffb7316cd2531be3acfc51dcb' 
  AND token = 'QTlaNHkfC9t7vP1/8BGQpi3E4xpuErFl99IEk6ib7ow=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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