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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '365b3ae12fd3fe6b15cc4d3c2e550bdea25c9368112da960618a5bb8f08d95e5' 
  AND token = '5clyLqzK0T2+e3dq15lcuyEp8C8w3ZMTII88g6VVYos=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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