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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '35ab43d30817ae6fe107ab0fa2fb5a05a7454b74a621e6684b8a0bd31af43430' 
  AND token = 'c6VxMPOXyy3K4NzYRXJiykgAHm+axPW5d/oXap35+Rw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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