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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82e40ffe9326f31b9555b3f6e49f27ec94c95ac8c3e7b8997b148bce233ec421' 
  AND token = 'WChpBUd8xLXrVza4YYMy63XPmacXWLDvmaafJFac0e0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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