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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9c17a3fe4a5cafd5110f46596cda0af1219df9056707fbffdff1b301f9acfd8' 
  AND token = '1BDc1yC9QDKt4yjFJaKeiqOd8PpRa8De2RLNu196ad0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00009

JSON explain

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