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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b74023e3963e606e7551de310577d616706e2908e0c6642a25d4b22f8b7a20b4' 
  AND token = '1xlN2EkQYfgOb/a78nJK9PrtOFj0tww9XgTEhSHJYTw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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