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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '41b19e9ded68fed5b5354c9f78acb58b39eb2e4bf64ffc0b388526efc9178a92' 
  AND token = '24b7JsG/1DdlpA0mFkGd8NW1KrS2NzYVJONrUQavr6U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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