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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '690d6ebe849a5bb9d3c7ac647a42a8dfd154488ddcbf3b278d0f63162e305003' 
  AND token = 'qalQS1pIDSe7leEQWCnt0iDuZeG4KumLBG0iuYNmCkI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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