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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aecae32f1199278ffdbd1152c3af93ead6ca9ae18cc08a1647c2098d3621a543' 
  AND token = '/cD+S/ZuNc4QR0HS+NkP3voEt7Z5pktb5zyKtV9NHDM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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